Double-frequency band-pass filter based on electromagnetic mixed coupling

A dual-frequency band-pass and electromagnetic hybrid technology, which is applied in the direction of waveguide devices, circuits, electrical components, etc., can solve the problem of difficult bandwidth adjustment and achieve the effect of compact structure

Inactive Publication Date: 2015-03-25
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0004] The purpose of the present invention is to propose a dual-frequency bandpass filter based on electromagnetic hybrid coupling, w...

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  • Double-frequency band-pass filter based on electromagnetic mixed coupling

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Embodiment Construction

[0012] The present invention will be further described below in conjunction with accompanying drawing and specific embodiment: figure 1 As shown, a dual-frequency bandpass filter based on electromagnetic hybrid coupling, the lower surface of its dielectric substrate 7 is completely covered by a metal layer, the metal layer on the upper surface includes a first input and output feeder 1, a second input and output feeder 2, The first dual-frequency resonator 3, the second dual-frequency resonator 4, the interdigitated capacitor 5, the short-circuit stub 6, and the metallized through hole 34 in the dielectric substrate 7 connect the metal layers on the upper and lower surfaces.

[0013] Further, the first and second input and output feeders 1 and 2 are 50-ohm microstrip lines corresponding to specific substrate parameters, which are respectively connected to the middle of the first high-impedance microstrip line 32 of the first and second resonators; The first resonator 3 and the...

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Abstract

The invention discloses a double-frequency band-pass filter based on electromagnetic mixed coupling. The double-frequency band-pass filter is structurally characterized in that the lower surface of a medium substrate (7) is completely covered with a metal layer, the portion, on the upper surface, of the metal layer comprises a first input/output feeder line (1), a second input/output feeder line (2), a first double-frequency resonator (3), a second double-frequency resonator (4), an interdigital capacitor (5) and a short circuit branch knot (6), and metalized through holes (34) in the medium substrate (7) connect the portion, on the upper surface, of the metal layer with the portion, on the lower surface, of the metal layer. The first double-frequency resonator (3) and the second double-frequency resonator (4) generate electrical coupling through the interdigital capacitor (5) and generate magnetic coupling through the short circuit branch knot (6). The mixed coupling has the advantages that the electrical coupling can independently adjust first pass-band bandwidth, and the magnetic coupling can independently adjust second pass-band bandwidth. The filter is compact in structure, easy to integrate, short in process cycle, and capable of being used for a double-frequency transceiver for frequency selection.

Description

technical field [0001] The invention relates to a dual-frequency bandpass filter, which belongs to the technical field of microwave passive devices. Background technique [0002] With the rapid development of wireless communication technology, people continue to propose new communication standards and develop new technologies, such as from the early GSM, CDMA, WCDMA to the current TD-SCDMA, WLAN, WiMAX, etc., the frequency band division is getting finer and finer. The multi-band communication system that can be compatible with various existing communication resources at the same time has become a research hotspot. Using multi-band transceivers, compared with multiple single-band transceivers, due to the use of multi-frequency front-end devices such as multi-frequency antennas, multi-frequency filters, and multi-frequency low-noise amplifiers, the volume of the system can be reduced by more than half. Many devices are shared or reused, the system power consumption is also re...

Claims

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Application Information

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IPC IPC(8): H01P1/203
Inventor 林先其程飞张瑾江源宋开军樊勇
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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